thanks for the input, everyone.

She has actually never ridden a tricycle either. She has always steered clear of any ride on toy. I've let the issue go for the past year. We got her a bike for her birthday last May and she fell. It was nothing traumatic, but she hasn't gone near it in a year, now as her birthday is coming up and weather is starting to get warmer and nicer so we could get outside, I have thought about bring the issue up again. I honestly think she would feel good about herself if she could learn to ride a bike and that she would enjoy it. I am not going to make it a power struggle or a big deal. I can't blame her reluctance on tipping over that one time because it has been there since birth. I guess a part of me worries it signals something is off with her balance or coordination and I should do something to help her.